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Publications (10 of 22) Show all publications
Gudasz, C., Karlsson, J. & Bastviken, D. (2021). When does temperature matter for ecosystem respiration?. Environmental Research Communications (ERC), 3(12), Article ID 121001.
Open this publication in new window or tab >>When does temperature matter for ecosystem respiration?
2021 (English)In: Environmental Research Communications (ERC), E-ISSN 2515-7620, Vol. 3, no 12, article id 121001Article in journal (Refereed) Published
Abstract [en]

The temperature response of ecosystem processes is key to understand and predict impacts of climate change. This is especially true for respiration, given its high temperature sensitivity and major role in the global carbon cycle. However, similar intrinsic temperature sensitivity for respiration does not mean comparable temperature effects across ecosystems and biomes because non-temperature factors can be more important. Here we analyzed soil and sediment respiration data and found that in temperature ranges corresponding to high latitude mean temperatures, absolute respiration rates aremore sensitive to non-temperature factors than to projected direct temperature effects. However, at higher temperatures (>20 °C) the direct effect of temperature mediated by temperature sensitivity will likely be more important over changes in non-temperature factors in shaping how respiration change over time. This supports past suggestions that the relatively small projected temperature increase at low (tropical) latitudes may have a large direct impact on absolute respiration. In contrast, absolute respiration rates at high (boreal/arctic) latitudes will likely bemore sensitive on the development of the non-temperature factors than on the direct effects of the large projected temperature increase there.

Social media abstract: Respirationmay be less dependent to changes in temperature at higher than lower latitudes.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2021
Keywords
Respiration, Sediments, Soils, Temperature
National Category
Environmental Sciences
Identifiers
urn:nbn:se:umu:diva-191127 (URN)10.1088/2515-7620/ac3b9f (DOI)000728399600001 ()2-s2.0-85122150504 (Scopus ID)
Funder
Swedish Research Council Formas, 2018-01794Swedish Research Council Formas, 2020-01979Knut and Alice Wallenberg Foundation, 2016.0083Swedish Research Council, 2012-43506-98683-24Swedish Research Council, 2016-04829
Available from: 2022-01-10 Created: 2022-01-10 Last updated: 2022-12-08Bibliographically approved
Berggren, M., Gudasz, C., Guillemette, F., Hensgens, G., Ye, L. & Karlsson, J. (2020). Systematic microbial production of optically active dissolved organic matter in subarctic lake water. Limnology and Oceanography, 65(5)
Open this publication in new window or tab >>Systematic microbial production of optically active dissolved organic matter in subarctic lake water
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2020 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 65, no 5Article in journal (Refereed) Published
Abstract [en]

The ecology and biogeochemistry of lakes in the subarctic region are particularly sensitive to changes in the abundance and optical properties of dissolved organic matter (DOM). External input of colored DOM to these lakes is an extensively researched topic, but little is known about potential reciprocal feedbacks between the optical properties of DOM and internal microbial processes in the water. We performed 28-day dark laboratory incubation trials on water from 101 subarctic tundra lakes in northern Sweden, measuring the microbial decay of DOM and the resulting dynamics in colored (CDOM) and fluorescent (FDOM) DOM components. While losses in dissolved oxygen during the incubations corresponded to a 20% decrease in mean DOM, conversely the mean CDOM and total FDOM increased by 22% and 30%, respectively. However, the patterns in microbial transformation of the DOM were not the same in all lakes. Notably, along the gradient of increasing ambient CDOM (water brownness), the lakes showed decreased microbial production of protein-like fluorescence, lowered DOM turnover rates and decreasing bacterial growth per unit of DOM. These trends indicate that browning of subarctic lakes systematically change the way that bacteria interact with the ambient DOM pool. Our study underscores that there is no unidirectional causal link between microbial processes and DOM optical properties, but rather reciprocal dependence between the two.

Place, publisher, year, edition, pages
Association for the Sciences of Limnology and Oceanography (ASLO), 2020
National Category
Oceanography, Hydrology and Water Resources Ecology
Identifiers
urn:nbn:se:umu:diva-165344 (URN)10.1002/lno.11362 (DOI)000493864600001 ()2-s2.0-85074762468 (Scopus ID)
Funder
Swedish Research Council, 2016-0527Knut and Alice Wallenberg Foundation, 2016.0083Swedish Research Council Formas, 239-2014-698Swedish Research Council Formas, 2017-00772
Available from: 2019-11-26 Created: 2019-11-26 Last updated: 2023-03-24Bibliographically approved
Gudasz, C., Ruppenthal, M., Kalbitz, K., Cerli, C., Fielder, S., Oelmann, Y., . . . Karlsson, J. (2017). Contributions of terrestrial organic carbon to northern lake sediments. Limnology and Oceanography Letters, 2(6), 218-227
Open this publication in new window or tab >>Contributions of terrestrial organic carbon to northern lake sediments
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2017 (English)In: Limnology and Oceanography Letters, E-ISSN 2378-2242, Vol. 2, no 6, p. 218-227Article in journal (Refereed) Published
Abstract [en]

Sediments of northern lakes sequester large amounts of organic carbon (OC), but direct evidence of the relative importance of their sources is lacking. We used stable isotope ratios of nonexchangeable hydrogen (δ2Hn) in topsoil, algae, and surface sediments in order to measure the relative contribution of terrestrial OC in surface sediments of 14 mountainous arctic and lowland boreal lakes in Sweden. The terrestrial contribution to the sediment OC pool was on average 66% (range 46–80) and similar between arctic and boreal lakes. Proxies for the supply of terrestrial and algal OC explained trends in the relative contribution of terrestrial OC across lakes. However, the data suggest divergent predominant sources for terrestrial OC of sediments in Swedish lakes, with dissolved matter dominating in lowland boreal lakes and particulate OC in mountainous arctic lakes.

National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-142341 (URN)10.1002/lol2.10051 (DOI)2-s2.0-85050610090 (Scopus ID)
Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2023-03-24Bibliographically approved
Sobek, S., Gudasz, C., Koehler, B., Tranvik, L. J., Bastviken, D. & Morales-Pineda, M. (2017). Temperature dependence of apparent respiratory quotients and oxygen penetration depth in contrasting lake sediments. Journal of Geophysical Research - Biogeosciences, 122(11), 3076-3087
Open this publication in new window or tab >>Temperature dependence of apparent respiratory quotients and oxygen penetration depth in contrasting lake sediments
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2017 (English)In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 122, no 11, p. 3076-3087Article in journal (Refereed) Published
Abstract [en]

Lake sediments constitute an important compartment in the carbon cycle of lakes, by burying carbon over geological timescales and by production and emission of greenhouse gases. The degradation of organic carbon (OC) in lake sediments is linked to both temperature and oxygen (O-2), but the interactive nature of this regulation has not been studied in lake sediments in a quantitative way. We present the first systematic investigation of the effects of temperature on the apparent respiratory quotient (RQ, i.e., the molar ratio between carbon dioxide (CO2) production and O-2 consumption) in two contrasting lake sediments. Laboratory incubations of sediment cores of a humic lake and an eutrophic lake across a 1-21 degrees C temperature gradient over 157days revealed that both CO2 production and O-2 consumption were positively, exponentially, and similarly dependent on temperature. The apparent RQ differed significantly between the lake sediments (0.630.26 and 0.990.28 in the humic and the eutrophic lake, respectively; meanSD) and was significantly and positively related to temperature. The O-2 penetration depth into the sediment varied by a factor of 2 over the 1-21 degrees C temperature range and was significantly, negatively, and similarly related to temperature in both lake sediments. Accordingly, increasing temperature may influence the overall extent of OC degradation in lake sediments by limiting O-2 supply to aerobic microbial respiration to the topmost sediment layer, resulting in a concomitant shift to less effective anaerobic degradation pathways. This suggests that temperature may represent a key controlling factor of the OC burial efficiency in lake sediments.

Place, publisher, year, edition, pages
Washington: American Geophysical Union (AGU), 2017
Keywords
limnology, sediment, aquatic biogeochemistry, respiration
National Category
Geosciences, Multidisciplinary
Identifiers
urn:nbn:se:umu:diva-142338 (URN)10.1002/2017JG003833 (DOI)000418086800024 ()2-s2.0-85034849591 (Scopus ID)
Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2023-03-24Bibliographically approved
Seekell, D. A. & Gudasz, C. (2016). Long-term pCO(2) trends in Adirondack Lakes. Geophysical Research Letters, 43(10), 5109-5115
Open this publication in new window or tab >>Long-term pCO(2) trends in Adirondack Lakes
2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 10, p. 5109-5115Article in journal (Refereed) Published
Abstract [en]

Lakes are globally significant sources of CO2 to the atmosphere. However, there are few temporally resolved records of lake CO2 concentrations and long-term patterns are poorly characterized. We evaluated annual trends in the partial pressure of CO2 (pCO2) based on chemical measurements from 31 Adirondack Lakes taken monthly over an 18 year period. All lakes were supersaturated with CO2 and were sources of CO2 to the atmosphere. There were significant pCO2 trends in 29% of lakes. The median magnitude of significant positive trends was 32.1 µatm yr−1. Overall, 52% of lakes had pCO2 trends greater than those reported for the atmosphere and ocean. Significant trends in lake pCO2 were attributable to regional recovery from acid deposition and changing patterns of ice cover. These results illustrate that lake pCO2 can respond rapidly to environmental change, but the lack of significant trend in 71% of lakes indicates substantial lake-to-lake variation in magnitude of response.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2016
Keywords
lakes, CO2, trends, acid rain, carbon cycle, Adirondack Park
National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-124148 (URN)10.1002/2016GL068939 (DOI)000378347500055 ()2-s2.0-84971602424 (Scopus ID)
Available from: 2016-07-22 Created: 2016-07-21 Last updated: 2023-03-24Bibliographically approved
Steger, K., Premke, K., Gudasz, C., Boschker, H. & Tranvik, L. J. (2015). Comparative study on bacterial carbon sources in lake sediments: the role of methanotrophy. Aquatic Microbial Ecology, 76(1), 39-47
Open this publication in new window or tab >>Comparative study on bacterial carbon sources in lake sediments: the role of methanotrophy
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2015 (English)In: Aquatic Microbial Ecology, ISSN 0948-3055, E-ISSN 1616-1564, Vol. 76, no 1, p. 39-47Article in journal (Refereed) Published
Abstract [en]

Methane-derived carbon can be important in both benthic and pelagic food webs. Either generated in the anaerobic layers of the sediment or in the anaerobic hypolimnion of stratified eutrophic lakes, methane is an excellent carbon source for aerobic methanotrophic bacteria. The very negative methane δ13C-signal in the methanotrophic biomass provides an excellent opportunity to trace the use of methane-derived carbon in food webs. We studied carbon sources of benthic bacteria in a range of Swedish lakes with different inputs of terrestrial organic carbon and indigenous primary production. We analyzed the 13C:12C ratios in phospholipid-derived fatty acids, which serve as biomarkers for specific groups of Bacteria. We demonstrate that methane is an important carbon source for sediment bacteria, not only for the methanotrophic community but also for the non-methanotrophic heterotrophic bacteria. This most likely indirect utilization of isotopically highly depleted methane masks the stable isotope signatures for terrestrial input and local primary production in the heterotrophic bacterial community.

Place, publisher, year, edition, pages
Inter-Research Science Center, 2015
Keywords
Benthic microbes, Boreal lakes, Methanotrophic bacteria, Phospholipid-derived fatty acid, PLFA, Stable isotopes
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:umu:diva-130872 (URN)10.3354/ame01766 (DOI)000362667300004 ()2-s2.0-84940371433 (Scopus ID)
Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2024-02-06Bibliographically approved
Gudasz, C., Sobek, S., Bastviken, D., Koehler, B. & Tranvik, L. J. (2015). Temperature sensitivity of organic carbon mineralizationin contrasting lake sediments. Journal of Geophysical Research - Biogeosciences, 120(7), 1215-1225
Open this publication in new window or tab >>Temperature sensitivity of organic carbon mineralizationin contrasting lake sediments
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2015 (English)In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 120, no 7, p. 1215-1225Article in journal (Refereed) Published
Abstract [en]

Temperature alone explains a great amount of variation in sediment organic carbon (OC) mineralization. Studies on decomposition of soil OC suggest that (1) temperature sensitivity differs between the fast and slowly decomposition OC and (2) over time, decreasing soil respiration is coupled with increase in temperature sensitivity. In lakes, autochthonous and allochthonous OC sources are generally regarded as fast and slowly decomposing OC, respectively. Lake sediments with different contributions of allochthonous and autochthonous components, however, showed similar temperature sensitivity in short-term incubation experiments. Whether the mineralization of OC in lake sediments dominated by allochthonous or autochthonous OC has different temperature sensitivity in the longer term has not been addressed. We incubated sediments from two boreal lakes that had contrasting OC origin (allochthonous versus autochthonous), and OC characteristics (C/N ratios of 21 and 10) at 1, 3, 5, 8, 13, and 21°C for five months. Compared to soil and litter mineralization, sediment OC mineralization rates were low in spite of low apparent activation energy (Ea). The fraction of the total OC pool that was lost during five months varied between 0.4 and 14.8%. We estimate that the sediment OC pool not becoming long-term preserved was degraded with average apparent turnover times between 3 and 32 years. While OC mineralization was strongly dependent on temperature as well as on OC composition and origin, temperature sensitivity was similar across lakes and over time. We suggest that the temperature sensitivity of OC mineralization in lake sediments is similar across systems within the relevant seasonal scales of OC supply and degradation.

National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-130860 (URN)10.1002/2015JG002928 (DOI)000359868200003 ()2-s2.0-84939271095 (Scopus ID)
Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2024-02-06Bibliographically approved
Karlsson, J., Bergström, A.-K., Byström, P., Gudasz, C., Rodriguez, P. & Hein, C. (2015). Terrestrial organic matter input suppresses biomass production in lake ecosystems. Ecology, 96(11), 2870-2876
Open this publication in new window or tab >>Terrestrial organic matter input suppresses biomass production in lake ecosystems
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2015 (English)In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 96, no 11, p. 2870-2876Article in journal (Refereed) Published
Abstract [en]

Terrestrial ecosystems export large amounts of organic carbon (t-OC) but the net effect of this OC on the productivity of recipient aquatic ecosystems is largely unknown. In this study of boreal lakes, we show that the relative contribution of t-OC to individual top consumer (fish) biomass production, and to most of their potential prey organisms, increased with the concentration of dissolved organic carbon (DOC; dominated by t-OC sources) in water. However, the biomass and production of top consumers decreased with increasing concentration of DOC, despite their substantial use (up to 60%) of t-OC. Thus, the results suggest that although t-OC supports individual consumer growth in lakes to a large extent, t-OC input suppresses rather than subsidizes population biomass production.

Place, publisher, year, edition, pages
Ecological Society of America, 2015
Keywords
allochthonous organic matter, boreal lakes, lake ecosystem, productivity, subsidy, terrestrial organic rbon, t-OC, Umea, Sweden, LGIORGIO PA, 1994, LIMNOLOGY AND OCEANOGRAPHY, V39, P772 nentzap Andrew J., 2014, NATURE COMMUNICATIONS, V5, rphy J, 1962, Anal Chim Acta, V27, P31 lis GA, 1997, ANNUAL REVIEW OF ECOLOGY AND SYSTEMATICS, V28, P289 rlsson Jan, 2012, LIMNOLOGY AND OCEANOGRAPHY, V57, P1042 dasz Cristian, 2012, LIMNOLOGY AND OCEANOGRAPHY, V57, P163 pelberg M, 1995, WATER AIR AND SOIL POLLUTION5th International Conference on Acidic Deposition - ience and Policy: Acid Reign 95, JUN 26-30, 1995, GOTHENBURG, SWEDEN, V85, P401 ehl S, 2005, ECOLOGY, V86, P2931 nes Stuart E., 2012, Freshwater Reviews, V5, P37 gesten G, 2004, GLOBAL CHANGE BIOLOGY, V10, P141 rsson L., 1988, P203 rsson L, 1996, ECOLOGY, V77, P900 rane Jan-Erik, 2014, ECOSYSTEMS, V17, P1040 rlsson J, 2004, FRESHWATER BIOLOGY, V49, P526 rlsson J, 2005, LIMNOLOGY AND OCEANOGRAPHY, V50, P538 rlsson Jan, 2007, OIKOS, V116, P1691 asko Ashley D., 2012, ENVIRONMENTAL REVIEWS, V20, P173 nstad Anders G., 2014, ECOLOGY LETTERS, V17, P36 rpenter SR, 1998, LIMNOLOGY AND OCEANOGRAPHY, V43, P73 helker J., 2012, Journal of Geophysical Research (Biogeosciences), V117, P1011 lomon Christopher T., 2011, ECOLOGY, V92, P1115 rggren Martin, 2014, ECOLOGY, V95, P1947
National Category
Environmental Sciences Oceanography, Hydrology and Water Resources Ecology
Identifiers
urn:nbn:se:umu:diva-113747 (URN)10.1890/15-0515.1 (DOI)000365521600003 ()2-s2.0-85047290547 (Scopus ID)
Available from: 2015-12-29 Created: 2015-12-28 Last updated: 2023-03-23Bibliographically approved
Osman, O. A., Gudasz, C. & Bertilsson, S. (2014). Diversity and abundance of aromatic catabolic genes in lake sediments in response to temperature change. FEMS Microbiology Ecology, 88(3), 468-481
Open this publication in new window or tab >>Diversity and abundance of aromatic catabolic genes in lake sediments in response to temperature change
2014 (English)In: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 88, no 3, p. 468-481Article in journal (Refereed) Published
Abstract [en]

The abundance and composition of genes involved in the catabolism of aromatic compounds provide important information on the biodegradation potential of organic pollutants and naturally occurring compounds in the environment. We studied catechol 2, 3 dioxygenase (C23O) and benzylsuccinate synthase (bssA) genes coding for key enzymes of aerobic and anaerobic degradation of aromatic compounds in experimental incubations with sediments from two contrasting lakes; humic lake Svarttjärn and eutrophic Vallentunasjön, respectively. Sediment cores from both lakes were incubated continuously for 5 months at constant temperatures ranging from 1.0 to 21.0 °C. The difference in C23O gene composition of the sediment analyzed at the end of the experiment was larger between lakes, than among temperature treatments within each lake. The abundance of C23O gene copies and measured respiration was positively correlated with temperature in Vallentunasjön, whereas putative C23O genes were present in lower concentrations in Svarttjärn sediments. Putative bssA genes were only detected in Svarttjärn. For both lakes, the two catabolic genes were most abundant in the surface sediment. The results emphasize the important role of temperature and nutrient availability in controlling the functional potential of sediment microorganisms and reveal differences between systems with contrasting trophic status. A better understanding of catabolic pathways and enzymes will enable more accurate forecasting of the functional properties of ecosystems under various scenarios of environmental change. 

National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-130864 (URN)10.1111/1574-6941.12312 (DOI)
Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2018-10-04Bibliographically approved
Marotta, H., Pinho, L., Gudasz, C., Bastviken, D., Tranvik, L. J. & Enrich-Prast, A. (2014). Greenhouse gas production in low-latitude lake sediments responds strongly to warming. Nature Climate Change, 4(6), 467-470
Open this publication in new window or tab >>Greenhouse gas production in low-latitude lake sediments responds strongly to warming
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2014 (English)In: Nature Climate Change, ISSN 1758-678X, E-ISSN 1758-6798, Vol. 4, no 6, p. 467-470Article in journal (Refereed) Published
Abstract [en]

Inland water sediments receive large quantities of terrestrial organic matter and are globally important sites for organic carbon preservation. Sediment organic matter mineralization is positively related to temperature across a wide range of high-latitude ecosystems, but the situation in the tropics remains unclear. Here we assessed temperature effects on the biological production of CO2 and CH4 in anaerobic sediments of tropical lakes in the Amazon and boreal lakes in Sweden. On the basis of conservative regional warming projections until 2100 (ref. ), we estimate that sediment CO2 and CH4 production will increase 9-61% above present rates. Combining the CO2 and CH4 as CO2 equivalents (CO2eq; ref. ), the predicted increase is 2.4-4.5 times higher in tropical than boreal sediments. Although the estimated lake area in low latitudes is 3.2 times smaller than that of the boreal zone, we estimate that the increase in gas production from tropical lake sediments would be on average 2.4 times higher for CO2 and 2.8 times higher for CH4. The exponential temperature response of organic matter mineralization, coupled with higher increases in the proportion of CH4 relative to CO2 on warming, suggests that the production of greenhouse gases in tropical sediments will increase substantially. This represents a potential large-scale positive feedback to climate change.

Place, publisher, year, edition, pages
Nature Publishing Group, 2014
National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-130892 (URN)10.1038/NCLIMATE2222 (DOI)000337138700022 ()
Funder
The Swedish Foundation for International Cooperation in Research and Higher Education (STINT)
Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2018-11-16Bibliographically approved
Projects
Understanding and modeling biome-scale nonlinearities in aquatic carbon burial [2012-06650_VR]; Uppsala University
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4949-9792

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